<template>
  <div>
    <!-- 无id时, 可以使用index(反正也是就地更新) -->
    <div v-for="(item, index) in arr" :key="index" style="display: inline-block">
      <input v-model="isCheck" type="checkbox" :value="item" />
      &nbsp;<span>{{ item }}</span>&nbsp;&nbsp;&nbsp;
    </div>
    <p>你选中的元素, 累加的值和为: {{ total }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      isCheck: []
    };
  },
  computed: {
    total() {
      let sum = 0
      this.isCheck.forEach(item => sum += item)
      return sum
    }
  }
};
</script>